|
NDSU will again offer disease forecasting system N
DSU will again offer its disease forecasting system on the web (www.ag. ndsu.nodak.edu/cropdisease)
and through updated, summarized recordings that producers can access toll-free by phone at 1-888-248-7357.The forecasting system tracks fungal spores, wheat growth development, and weather conditions to pinpoint in
near real-time the potential for scab, tan spot, and Septoria blotch disease infections in wheat. The system this year will also be able to track leaf rust, says project manager, NDSU plant pathologist Len Francl.
Research at NDSU indicates that fungicide application timing is a key factor for controlling scab in wheat and barley. Optimum timing in spring wheat and durum is early flowering (Feekes growth stage 10.51) and in
barley, at early, full head emergence (see Table 1).
Table 1. Effect of timing of application of Folicure (4 fl oz/acre) on field severity of scab in greenhouse, 1999 |
Application of Growth Stage* |
Grandin
HRS |
Munich
Durum |
Robust
Barley |
10.3 |
1.6 |
16.4 |
1.5 |
10.51** |
0.5 |
3.5 |
1.3 |
10.54 |
7.0 |
22.5 |
1.9 |
Untreated |
7.0 |
32.1 |
3.2 |
* Feeks growth stage 10.3 = 50% head emergence; 10.51 = early flowering' 10.54 = kernel water ripe
**Barley sprayed at Feekes 10.5 = head fully emerged |
Research at NDSU indicates that a full label rate of Folicur (4 fl oz) provides better control of scab than lower use rates, both in the field and
in the greenhouse (see Table 2).
Table 2. Effect of Folicur rate on field severity of scab in Grandin wheat, field and greenhouse, NDSU. |
Folicure Rate |
Scab Field Severity in Fargo Field |
Scab Field Severity in Greenhouse |
6 fl oz |
--- |
5.2 |
4 fl oz |
1.6 |
4.5 |
3 fl oz |
4.3 |
7.9 |
2 fl oz |
7.4 |
11.0 |
Untreated |
-- |
8.0 |
|
